图像调整大小时，Codeigniter 图像旋转

Question

我有一个尺寸为 (W-3000 X H-4000) 的图像。当我上传它并调整大小时，它总是显示为横向模式，意味着新尺寸是 w-1067 X h-800。我想为横向或 600X800 的纵向创建这张图片。这是我的代码：

    $config['upload_path'] = './uploads/';
    $config['allowed_types'] = 'jpg|jpeg|gif|png';
    $config['max_size'] = '5000';
    $this->load->library('upload', $config);

    //check if a file is being uploaded
    if(strlen($_FILES["testimg"]["name"])>0){

        if ( !$this->upload->do_upload("testimg"))//Check if upload is unsuccessful
        {
            $error = array('error' => $this->upload->display_errors());
            print_r($errors);
        }
        else
        {

            $config['image_library'] = 'gd2';
            $config['source_image'] = $this->upload->upload_path.$this->upload->file_name;
            $config['width'] = '1';
            $config['height'] = '800';
            $config['maintain_ratio'] = TRUE;
            $config['master_dim'] = 'height';
            $this->load->library('image_lib',$config); 

            if (!$this->image_lib->resize()){  
                echo "error";
            }else{
                echo "success";
            }
       }      
   }  

在我的代码中，高度始终为 800 像素。对于 3000X4000 尺寸的图像是可以的。但是当我使用 4000X3000 尺寸的图像时呢？有人可以帮我解决这个问题吗？谢谢

Answer 1

$filename = $_FILES['testing']['tmp_name'];
list($width, $height) = getimagesize($filename);

if ($width >= $height)
{
    $config['width'] = 800;
    $config['master_dim'] = 'width';
}
else
{
    $config['height'] = 800;
    $config['master_dim'] = 'height';
}

甚至更短，您可以使用 master_dim 的“auto”参数来确定哪个值更大 - 宽度或高度。

$filename = $_FILES['testing']['tmp_name'];
list($width, $height) = getimagesize($filename);

if ($width >= $height)
{
    $config['width'] = 800;
}
else
{
    $config['height'] = 800;
}

$config['master_dim'] = 'auto';

Answer 2

感谢@Rpojka 的回答。但我用 exif_read_data() 修复了它。这是我的代码：

    $config['upload_path'] = './uploads/';
    $config['allowed_types'] = 'jpg|jpeg|gif|png';
    $config['max_size'] = '6048';
    $this->load->library('upload', $config);

    //check if a file is being uploaded
    if(strlen($_FILES["testimg"]["name"])>0){

        if ( !$this->upload->do_upload("testimg"))//Check if upload is unsuccessful
        {
            $error = array('error' => $this->upload->display_errors());
            print_r($errors);
        }
        else
        {

            $config['image_library'] = 'gd2';
            $config['source_image'] = $this->upload->upload_path.$this->upload->file_name;
            $filename = $_FILES['testimg']['tmp_name'];


            $imgdata=exif_read_data($this->upload->upload_path.$this->upload->file_name, 'IFD0');


            list($width, $height) = getimagesize($filename);
            if ($width >= $height){
                $config['width'] = 800;
            }
            else{
                $config['height'] = 800;
            }
            $config['master_dim'] = 'auto';


            $this->load->library('image_lib',$config); 

            if (!$this->image_lib->resize()){  
                echo "error";
            }else{

                $this->image_lib->clear();
                $config=array();

                $config['image_library'] = 'gd2';
                $config['source_image'] = $this->upload->upload_path.$this->upload->file_name;


                switch($imgdata['Orientation']) {
                    case 3:
                        $config['rotation_angle']='180';
                        break;
                    case 6:
                        $config['rotation_angle']='270';
                        break;
                    case 8:
                        $config['rotation_angle']='90';
                        break;
                }

                $this->image_lib->initialize($config); 
                $this->image_lib->rotate();

            }
       }      
   }  

这是exif方向图

 1        2       3      4         5            6           7          8

888888  888888      88  88      8888888888  88                  88  8888888888
88          88      88  88      88  88      88  88          88  88      88  88
8888      8888    8888  8888    88          8888888888  8888888888          88
88          88      88  88
88          88  888888  888888